There is an unused blueprint for a summoned gargoyle that is identical to the standard creature, other than not dropping any items upon death and not turning into a statue. The ResRef of this unused creature is nw_s_gargoyle.

A gargoyle can be placed in its statue form. The statue form (ResRef: nw_stat_garg) is the first "Statue" in the "Miscellaneous" part of the standard placeable palette. The script that turns this statue into a creature is nw_o2_gargoyle.

The source code available in the Toolset for the gargoyle's OnHeartbeat eventhandler (nw_c2_gargoyle) is incorrect and should not be used for modifications. Fortunately, this incorrect script was not compiled by BioWare, so the game still uses the compiled version of the following script.